Device for inserting, positioning and beating up the weft thread in a loom

ABSTRACT

An inserter means for a loom carries the weft thread through the shed and beats up the last previously inserted thread by means of a rotating disc which presses against the thread, while the inserter means is held against lateral displacement by rollers which bear against a stationary reed.

United States Patent Ramon Balaguer Golobart Calle Valls y Tabemer, 11, Barcelona,

[72] Inventor Spam [21] Appl. No. 811,971

[22] Filed Apr. 1, 1969 [45] Patented Mar. 16, 1971 [32} Priority Apr. 25, 1968 [33] Spain [54] DEVICE FOR INSERTING, POSITIONING AND BEATING UP THE WEFI THREAD IN A LOOM 5 Claims, 7 Drawing Figs.

[52] U.S. Cl 139/123 [51] Int. Cl D03d 47/04 [50] Field of Search 139/116, 122, 1, 128

[ 56] References Cited UNITED STATES PATENTS 1,747,098 2/1930 Ambler 139/ 127 FOREIGN PATENTS 998,026 7/1965 Great Britain 139/ 123 OTHER REFERENCES 1,057,989 German Pub 8-1956 to Shimwell 139/ 127 Primary Examinerl-lenry S. Jaudon AttorneyChristen & Sabol ABSTRACT: An inserter means for a loom carries the weft thread through the shed and beats up the last previously inserted thread by means of a rotating disc which presses against the thread, while the inserter means is held against lateral displacement by rollers which bear against a stationary reed.

Patented March 16, 1971 3,570,549

2 Sheets-Sheet 1 Patented March 16,1971 4 3,570,549

2 Shasta-Sheet 2 DEVICE FOR INSER'IING, PGSITIONING AND BEATING UP THE WEFT THREAD IN A LOOM' The present invention relates to a device for inserting and positioning the weft thread in the shed of a loom, of the type in which the inserter, besides introducing the weft thread, performs the beating up of the thread against the fabric being formed, said inserter taking the place of the batten.

Different systems of inserter devices are known which perform these functions, including that based on a rigid inserter in the shape of a shaft, whose free end has an eye through which passes the weft thread which is to be inserted in the shed, the side of the inserting element rubbing over the weft thread to locate it in the line of formation of the fabric.

Another system is that made up of two aligned rigid inserters with rectilinear back and forth movement one after the other so that one of the two inserting elements introduces the weft thread coming from a stationary bobbin located on one side of the loom and simultaneously this inserting element.

heats up, against the line of formation of the fabric, the weft thread of the previous pass, namely that coming from the stationary bobbin on the other side of the loom, introduced by the other element of the inserter, these weft threads being located against said line of formation of the fabric during the movement of the inserting elements in the shed, by means of the friction that a boss, which each inserter has on its free end,

produces on the weft thread.

These known systems, although they can be used in.looms with very resistant warp threads and a loosely woven weft arrangement, have the drawbackboth in case the weft thread is located in the line of formation of the fabric by contact of the side of the inserter element, and in case it is by contact with the boss of the free end of the inserter elementthat the warp threads perform a braking action by the friction that said inserter elements generate, these latter having a tendency to carry with them the warp threads over which they rub and producing the consequent deformation in the warp, which besides limiting the speed of the loom, damages the appearance of the completed fabric.

Further, these known systems cannot make fabrics with a closely woven weft, since the inserting elements, when the lineal friction is performed on the weft thread, do not succeed in striking this thread home against the weft thread of the previous pass.

With these known systems, the width of the fabric is very limited, because the inserting element has only a guide at its entry into the shed and in its travel through the shed it rests on the weft thread by itself, with a bending in the inserting element occurring, which logically increases as it advances, so that at the end of the travel of the inserting element, it does not exert the same pressure as at the entry into the shed, which results in producing fabrics with an irregular weave.

In the device for inserting, positioning and driving home the weft thread of the present invention, all these drawbacks are eliminated, the rubbing of the inserting element against the warp threads, and the friction against the weft threads being eliminated completely.

With the device of the present inventionQfabrics can be made with a very close weave of the weft in the entire fabric, due to the fact that the device, during its entire travel through the shed,'is constantly guided, with some pressure being exerted at all points in its travel, thereby it being possible not only to make very closely woven fabrics, as has been said, but very wide fabrics with a uniform weave. The device of the present invention, is made up of an inserter means which comprises a freely rotating disc, which projects from the inserter and at least one roller that also rotates freely, which projects from the inserter on the opposite side of the disc, so that in the lineal movement of the inserter through the shed, the disc, by rotary contact, forces the weft thread home against the formation line of the fabric and simultaneously the roller is constantly in rotary contact with the teeth of a stationary reed, or the pressure that the roller exerts against the reed is the same as that the disc exerts against the line of formation of the fabric but in the opposite direction.

On the other hand, said inserter is provided on the front free end with means of fastening the weft thread to be drawn through the shed, these means being both mounted in the vicinity of the rotating disc and rollers, while at its back end the inserter is joined to the translation element of the loom.

For a better understanding of the invention, there is described below an embodiment, by way of nonlimiting example, with reference to the accompanying drawings, wherein:

FIG. I is a perspective view of the inserter means with the elements for fastening the weft thread in the unclamped position, the upper protective cover of the inserter being represented by fine dashed lines, and the weft thread by heavy dashed lines for greater clarity;

FIG. 2 is a perspective view of inserter with elements for fastening the weft thread in clamping position;

FIG. 3 is a schematic plan view at the moment the inserter enters the shed;

FIG. 4 is a schematic plan view of the inserter already introduced into the shed; 1

FIG. 5 is a schematic plan' view of the inserter beginning its return movement to its initial position;

FIG. 6 is a view looking in the direction of arrow A of FIG. 1, showing the means of fastening the weft thread; and

FIG. 7 is a sectional view along 8-8 of FIG. 4.

The inserting means which as a whole is designated by l, comprises a base 2, a vertical wall 3 and a cover 4, FIG. 2, with orifices Sand 6, for passage of weft thread 7. Between base 2 and cover 4 is supported a vertical shaft 8 that is solid with base 2, and fastened to cover 4 by a screw 9. On vertical shaft 8 is placed a rotatable disc 10, which projects sideways from base 2.

Adjacent to this disc 10 and extending through wall 3 by means of openings I1 and 12, are attached two rollers 13 and 14 which rotate freely on two shafts I5 and 16 mounted on supports 17 and 18 attached to wall 3, FIG. I.

The exposed side of the front end 21 of base 2 is bent upwardly at 22 to support a flat horizontally projecting portion 23 which is provided with an orifice 40 through which the weft thread 7 passes downwardly from the orifice 5 in the cover 4. Also provided at the front end is a shaft 30 which pivotally supports an arm 24 which extends through an opening (not shown) in the bent portion 22 so as to be positioned below portion 23. The free end 25 of this arm'is provided with an orifice 26 through which the thread passes from orifice 40. Also mounted on shaft 30, and turning with arm 24 is a flat spring member 27, connected with the arm by nuts 31 and 32. The spring extends above the portion 23 and at its free end 28 is provided with a downwardly extending semispherical projection 29.

The rear end 33 of base 2, FIGS. 1 and 2, has holes 34, 35, 36, and 37 for fastening inserter I to the reciprocating element 33, FIGS. 3, 4, and 5.

Operation of the device is as follows:

When the weft thread 7 is to be inserted and positioned in shed 39, the inserter means 1 starts its advance movement to be introduced into shed 39 as in FIG. 3, end 25 of the small movable arm 24 hits stop 41 located near edge 42 of fabric 43, whereby this arm 24 makes a turn on shaft 30 and, consequently, imparts a turn to flat spring 27, FIG. 6, until semispherical projection 29 is housed in orifice 40 of flat surface 23 clamping weft thread.7 which passes through said orifice 40, FIG. 2. Prior to this initial movement of inserter 1, cutting elements 44 and 45, of a known type, have cut the weft thread 7.

With the continuation of the advancing movement of inserter 1 toward the inside of shed 39, FIG. 4, rollers 13 and 14 make contact and slide on the teeth of stationary reed 46 and at the same time rotating disc 10 contacts and presses in its advance weft thread 7 already introduced in shed 39, forcefully beating weft thread 7 home against the line of formation 47 of fabric 43 with a pressure equal to and in the opposite direction to the pressure that rollers 13 and I4 exert against reed 46. Simultaneous with this advance, inserter I draws with it and introduces the new weft thread 48 into shed 39.

When inserter 1 has finished its forward travel through shed 39, FIG. 5, the free end 49 of weft thread 48 is held by a clamp 50 located close to the edge 51 of fabric 43. When inserter 1 begins its return to its initial position, weft thread 48, on being held by clamp 50, causes the small movable arm 24 and the flat spring 27 to swing and thereby take semispherical projection 29 out of orifice 40 of flat surface 23, said weft thread 48 being thus completely free. When inserter 1 follows its return movement while the free end 49 is clamped, arm 24 positions weft thread 48 in the vicinity of the line of formation 47 of fabric 43, and when inserter 1 reaches its initial position, represented in FIG. 3, a new cycle begins for beating said weft thread 48 home and introducing a new pass.

I claim:

1. Device for inserting and beating up weft threads in a loom having a stationary reed and an element reciprocatorily movable with respect to a shed formed by the loom, comprising inserter means, a disc, means for rotatably supporting the disc on the inserter means for beating up a weft thread for inserting it into a shed and for releasing said weft thread when inserted,

means for attaching the inserter means to said reciprocatorily movable element, and means for resisting lateral movement of the inserter means.

2. The invention defined in claim I, wherein said means for resisting lateral movement includes at least one roller. and means for mounting the roller on the inserter means for rolling contact with said stationary reed.

3. The invention defined in claim I, wherein said means for gripping and releasing a weft thread includes a flat surface provided with an orifice through which said weft thread passes, a movable spring element, and means for moving said spring element into and out of engagement with a weft thread in said orifice.

4. The invention defined in claim 3, wherein said means for moving the spring element includes an arm pivotally mounted on the inserter means.

5. The invention defined in claim 4, wherein said means for moving the spring element includes stop means attached to said loom adjacent the side of the fabric being woven. 

1. Device for inserting and beating up weft threads in a loom having a stationary reed and an element reciprocatorily movable with respect to a shed formed by the loom, comprising inserter means, a disc, means for rotatably supporting the disc on the inserter means for beating up a weft thread for inserting it into a shed and for releasing said weft thread when inserted, means for attaching the inserter means to said reciprocatorily movable element, and means for resisting lateral movement of the inserter means.
 2. The invention defined in claim 1, wherein said means for resisting lateral movement includes at least one roller, and means for mounting the roller on the inserter means for rolling contact with said stationary reed.
 3. The invention defined in claim 1, wherein said means for gripping and releasing a weft thread includes a flat surface provided with an orifice through which said weft thread passes, a movable spring element, and means for moving said spring element into and out of engagement with a weft thread in said orifice.
 4. The invention defined in claim 3, wherein said means for moving the spring element includes an arm pivotally mounted on the inserter means.
 5. The invention defined in claim 4, wherein said means for moving the spring element includes stop means attached to said loom adjacent the side of the fabric being woven. 